ch 1.3 - types & record of maintenance

8/14/2019 Ch 1.3 - Types & Record of Maintenance

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UNIT 1.3

General Objectives :Understand the types of maintenance

Specific Objectives :After learned this unit, youshould be able to :-

Explain about theBreakdown

Maintenance

Explain about theCorrective

Maintenance

Explain about theProtective

Maintenance

Explain about theModificationMaintenance

Discussio

n

Exercise

Exercis

e

Exercise


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Breakdown Maintenance

It is implement when a machine @equipment breakdown in operation period.

Usually the technician will do serviceactivity to the machine. This method cansave time but not effective in reduce costfor some machine.

Click to edit M

astSecond level

Third lev Fou

MAINTENANCE


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Normally an electric equipmentfailure are cause by the parts @components in the equipmentbecause of too long operation period.

Without a good maintenanceplanning, the component in the cctwill easily broken. As an example, this

is a type of failure that usually occurin a radio :-


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1. Failure in Power supply Circuit. Power Transformer Failure

. Cause by the open cct at the transformer coil.

. This will cause the radio power supply interrupted,where the primary coil will not induce the 2ndrycoil which contribute to the power supply failure.

MAINTENANCE


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2. Input Filter Capacitor Failure

a. Short Circuit. Filter capacitor is in a parallel condition with

the high voltage of positive & negative point.. This capacitor act as charger & discharger to get a

constant & linear direct current (dc).. If the cap is not in good condition, it will easily

broken.. I.E. when C1 short cct, the current load that

crossing the rectifier diode will become higher & will affect the diode to be in a high temp. & broken.

MAINTENANCE


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ter text stylesellevel

Fourth level Fifth level

2. Input Filter Capacitor Failure

b. Open Circuit. Electrolytic capacitor is made from an

electrolytic substances.. This substances are easily dry that will

made the capacitor to loss its capability & the cap value is decreased.

. This will effect the radio to produce a buzz

sound.. The DC voltage also will become lower

because of the ripple & sometimes itscause by a capacitor that is not properlyassemble where sometimes the inner part

MAINTENANCE


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2. Input Filter Capacitor Failure c. Leakage

. Electrolytic capacitor have an acceptable range of leakage. For every Micro Farad that is assemble toa 300 dc voltage, the leakage current isapproximately 0.1 0.25 mA.

. And for a good capacitor, the leakage is below 10mA.

. If the leakage is greater, the chemical substanceswill flow out.

. To check the cap condition, adjust the meter tothe ohm scale.

. If the meter pointer swiftly increase to the higher

range then turn slowly downward, this show that

MAINTENANCE

HOME


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Exercises :-

1. What is Breakdown maintenance?

2. Give 3 types of failure that canhappened to a component.

3. Explain the method that can beuse to check an electrolyticcapacitor.

HOME


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With this knowledge, maximumprotection can be given.

I.e., strength of temperature.

If the component cannot stand to hightemperature & strong vibration, so weneed to locate it at low temperature &

weak vibration area. So well protect theequipment effectively.


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c. How to protect an electric equipment.

. We need to do the maintanence routinely toguarantee the life period of an equipment.

. To makesure the component that is used in theequipment in a good condition & long lasting,take off the casing & clean up all the equipmentin the circuit with a dry & clean cloth.

. This is to make sure there is no dust that cangenerate electrostatic that can damage thecomponent. To clean the area that are out of sight, dont use high pressure air nozzel insteadof use a gentle brush. This is to avoid the dustfrom going to other area.

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MAINTENANCE


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To avoid failure from occur, makesure all the wireconnection arrangement in the equipment is orderlytied. Makesure the wire is not touching the componentthat emit heat because it can damage the wire. If ethere is a minor failure occur to the wire, the wireshould be replace a.s.a.p.To makesure all the adjustable button operateeffectively, use cleaner degreaser. Spray it to themoving are.For an equipment that are using battery, makesurereplace the weak battery to avoid acid that is produceby the battery not damage other equipment.

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MAINTENANCE

HOME


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Exercises :-

1. What is Protective maintenance?

2. Give 3 way to protect an electricequipment?

HOME


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3. Corrective MaintenanceTo makesure the equipment @ thecomponent follow the specification,corrective maintenance should be

implemented. No matter major @ minorfailure, corrective activity should be doneto maintain the strength of equipment.

. To repair the electrical equipment, theinformation of the equipment & therepairing skill is needed. Please refer tothe next page for example on how torepair a radio.

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MAINTENANCE


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MAINTENANCE

Driver Amplifier CircuitHOME


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In a group of 4, you are required todiscuss 3 types of failure that can occur toa driver amplifier circuit.

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Tanda Kerosakan Cara Memeriksa Tempat Kerosakan

Tiada Suara - Pemungut transistor pemacutidak mempunyai voltan.

- Isyarat audio alat janamasukan ke pemunguttransistor pemacumenghasilkan suara &masukan ke tapak transistor tidak mengeluarkan suara.

1. Gelung pertama alat ubahmasukan litar buka.

2. Perintang R1 litar buka.

Suara bising Kawalan bahana dikecilkanada juga hingar 1. Transistor pemacu rosak

Suara Serak Voltan pincang tapak & pengeluar sempurna.

1. Transistor penguat pemacurosak.

Suara lemah Voltan pincang tapak & pengeluar baik. 1. Kapasitor salur pirau , C4 litar buka.

Kadang-kadang adasuara

Voltan dan arus peringkat penguat pemacu sempurna.

1. Kawalan bahana rosak 2. Kapasitor penjodoh C5

sentuhan kurang baik.HOME


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Modification Maintenance

n It is implement to a machine @equipment based on conditioned @ its

cannot be repaired to be functioned asbefore. This might be happened to an oldmachine @ equipment where the sparepart were difficult to find.

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MAINTENANCE

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Terangkan cara-cara menguji satukapasitor elektrolitik & nyatakanberapakah nilai arus bocor bagi satukapasitor yang bernilai 1 f yangmenggunakan voltan arus terus 300V.

Apakah tujuan komponen-komponenelektrik dihindari dari habuk-habuk danbagaimana cara untuk membersihkannya.

Nyatakan kerosakan-kerosakan biasayang berlaku pada penguat pemacu dankomponen manakah yang mungkin rosak.

ch 1.3 - types & record of maintenance

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